Precision Resistors

[john]

As a "field expedient" it will probably work ok. The construction technique
of film parts employs this same idea, except the cross sectional area
of the printed resistor is controlled much more tightly. Qdope over the
trimmed area would be a great idea...

John K5MO


At 07:30 PM 5/15/03 -0700, Stu Lyon wrote:
>
>That's a bad idea. Modern resistors are made differently than the carbon
>resistors of old (real old, like 1935), when that technique sorta worked.
>Plus the moisture protection and stability goes straight down the tubes --
>exactly the opposite effect your trying to acheive.
>
>
>73, Stu W6CUX
>Winnetka, CA
>slyon at pacificnet.net
>
>
>----- Original Message -----
>From: "Charles Seitz" <cseitz at ENTER.NET>
>To: <HEATH at LISTSERV.TEMPE.GOV>
>Sent: Thursday, May 15, 2003 6:23 AM
>Subject: Precision Resistors
>
>
>> A suggestion for making special value resistors
>> that I was once told will work but I have never
>> actually tried it:
>>
>> File the body of a close value carbon resistor
>> to bring it to your desired resistance.
>> You might also try it with a 1% metal film
>> resistor.  If it works for a metal film part,
>> I would use it in preference to a carbon
>> part.  Carbon resistors do not have predictable
>> temperature stability and change value during
>> aging.
>>
>>                               ---  CHAS  WA2DYA
>>
>
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